Hi,

I'm using the ADE7878 for power monitoring and I have problems calibrating the IRMS.

I use current transformer with a CT of 2000. So I get the following value for IFS:

IFS = (0.5*2000) / (7,07 *SQR(2)) = 100.0151

My nominal current is 2.08A.

So I get an IrmsREF of 87179.

Without AIGAIN, the AIRMS register has the following value: 91500 (0.0915A).

I calculate AIGAIN: IrmsREF/IRMS -1 = (87179/2080000)-1)= -0.95808=0x855D67 and write 00855D67 to the AGAIN register.

Now with AGAIN the AIRMS register has the following value: 187259 (0.187259 A).

Where is the mistake?

Best regards Jens

Hello,

has anyone a solution?

Best regards